----------------------------------------------- --------- EDITED ---------------------------------------- --------------------------
添加部分现在可以正常使用按钮！
我使用相同的逻辑添加了新实现，但这一次，删除刚刚添加的部分。我试了一下，但问题是它没有删除刚刚添加的部分。
另外，我想在添加部分时使用g.addString但是我该怎么做呢？非常感谢你！
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Main {
private JFrame jf;
private JTextField jtf1;
private JTextField jtf2;
private Panel p;
private JComboBox jcb1;
private JComboBox jcb2;
private JButton button;
private String tools[] = {""};
//ActionListener Variables
private int string1 = 170;
private int string2 = 170;
private int yJtf1 = 140;
private int yJtf2 = 165;
private int cb1 = 143;
private int cb2 = 168;
private int count = 0;
public Main() {
jf = new JFrame();
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setSize(700, 700);
p = new Panel();
jtf1 = new JTextField("", 20);
jtf2 = new JTextField("", 20);
jcb1 = new JComboBox(tools);
jcb2 = new JComboBox(tools);
button = new JButton("+");
p.add(jtf1);
jtf1.setBounds(75, 30, 135, 25);
p.add(jtf2);
jtf2.setBounds(75, 60, 135, 25);
p.add(button);
plusButton.setBounds(350, 153, 41, 25);
button.addActionListener(new ButtonClicked());
p.add(button2);
plusButton.setBounds(350, 153, 41, 25);
minusButton.addActionListener(new NewButtonClicked());
p.add(jcb1);
jcb1.setBounds(80, 143, 80, 20);
p.add(jcb2);
jcb2.setBounds(80, 168, 80, 20);
jf.add(p);
jf.setVisible(true);
`
}
public class Panel extends JPanel {
public Panel() {
this.setLayout(null);
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Font font = new Font("Arial", Font.BOLD, 12);
g.setFont(font);
g.drawString("Things:", 27, 45);
g.drawString("Price:", 27, 75);
}
}
public static void main(String[] args) {
new Main();
}
class ButtonClicked implements ActionListener {
public void actionPerformed(ActionEvent ae) {
if (count < 3) {
string1 += 60;
string2 += 60;
jtf1 += 60;
jtf2 += 60;
cb1 += 60;
cb2 += 59;
JTextField jtf1 = new JTextField("", 20);
jtf1.setBounds(40, yJtf1, 40, 25);
p.add(jtf1);
JTextField jtf2 = new JTextField("", 20);
jtf2.setBounds(40, yJtf2, 40, 25);
p.add(jtf2);
JComboBox jcb1 = new JComboBox(tools);
jcb1.setBounds(80, cb1, 80, 20);
p.add(jcb1);
JComboBox jcb2 = new JComboBox(tools);
jcb2.setBounds(80, cb2, 80, 20);
p.add(jcb2);
------------->>>//NEW I WOULD LIKE TO IMPLEMENT (BUT HOW DO I USE 'g' TO ADD TO ANOTHER PANEL?)
Font font = new Font("TimesRoman", Font.BOLD, 12);
g.setFont(font);
g.drawString("Things:", 7, string1);
g.drawString("Price:", 165, string2);
p.revalidate();
p.repaint();
count++;
}
}
}
------------->>>//////NEWLY EDITED IMPLEMENTATION (DELETING SECTION)
class NewButtonClicked implements ActionListener {
public void actionPerformed(ActionEvent ae) {
if (count > 0 && count < 4) {
JTextField jtf1 = new JTextField("", 20);
JTextField jtf2 = new JTextField("", 20);
JComboBox jcb1 = new JComboBox(tools);
JComboBox jcb2 = new JComboBox(tools);
p.remove(jtf1);
p.remove(jtf2);
p.remove(jcb1);
p.remove(jcb2);
jtf1 -= 60;
jtf2 -= 60;
cb1 -= 60;
cb2 -= 59;
p.revalidate();
p.repaint();
count--;
}
}
}
}
答案 0 :(得分：0)
所以我运行你的代码，我改变了一点代码结构，并对重点进行了评论：
public class Main {
private JFrame jf;
private Panel p;
private JButton button;
private Object options[];
private String[] tools = {"value1","value2"}; // here put the different values you need in your combobox
//ActionListener Variables
private int string1 = 170;
private int string2 = 170;
private int yJtf1 = 80;
private int yJtf2 = 105;
private int cb1y = 83;
private int cb2y = 108;
private int count = 0;
private List<JComboBox<String>> cbs = new ArrayList<JComboBox<String>>(); //Keep References to your comboBoxs
private List<JTextField> tfs = new ArrayList<JTextField>(); //Keep References to your TextFields
public Main() {
initView();
}
//Method to create the view
public void initView(){
jf = new JFrame();
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setSize(700, 700);
p = new Panel();
JTextField thingsTextField = new JTextField("", 20);
thingsTextField.setBounds(75, 30, 135, 25);
JTextField priceTextField = new JTextField("", 20);
priceTextField.setBounds(75, 60, 135, 25);
p.add(thingsTextField);
p.add(priceTextField);
addSection();
button = new JButton("+");
button.setBounds(350, 153, 41, 25);
button.addActionListener(new ButtonClicked());
p.add(button);
jf.add(p);
jf.setVisible(true);
//You have to call those methods to redraw the panel
p.revalidate();
p.repaint();
}
public static void main(String[] args) {
new Main();
}
//This method is called to add a section with the "Plus" Button
public void addSection(){
if (count < 3) {
string1 += 60;
string2 += 60;
yJtf1 += 60;
yJtf2 += 60;
cb1y += 60;
cb2y += 59;
JTextField jtf1 = new JTextField("", 20);
jtf1.setBounds(40, yJtf1, 40, 25);
JTextField jtf2 = new JTextField("", 20);
jtf2.setBounds(40, yJtf2, 40, 25);
tfs.add(jtf1);
tfs.add(jtf2);
p.add(jtf1);
p.add(jtf2);
JComboBox<String> cb1 = new JComboBox<>(tools);
cb1.setBounds(80, cb1y, 80, 20);
JComboBox<String> cb2 = new JComboBox<>(tools);
cb2.setBounds(80, cb2y, 80, 20);
p.add(cb1);
p.add(cb2);
cbs.add(cb1);
cbs.add(cb2);
p.revalidate();
p.repaint();
//Font font = new Font("TimesRoman", Font.BOLD, 18);
//g.setFont(font);
}
count++;
}
class ButtonClicked implements ActionListener {
@Override
public void actionPerformed(ActionEvent ae) {
addSection();
}
}
public class Panel extends JPanel {
public Panel() {
this.setLayout(null);
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Font font = new Font("Arial", Font.BOLD, 12);
g.setFont(font);
g.drawString("Things:", 27, 45);
g.drawString("Price:", 27, 75);
}
}
}